Derivatives and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Fair Value of Forward Exchange Contracts not Designated as Hedging Instruments

The fair values of foreign exchange contracts are summarized below:

	Year Ended December 31,
	2017		2016
	(Amounts in thousands)
Current derivative assets	$	2,489	$	682
Noncurrent derivative assets	177		—
Current derivative liabilities	284		6,878
Noncurrent derivative liabilities	56		355

Impact of Net Changes in Fair Values of Forward Exchange Contracts Not Designated as Hedging Instruments

The impact of net changes in the fair values of foreign exchange contracts are summarized below:

	Year Ended December 31,
	2017		2016		2015
	(Amounts in thousands)
Gain recognized in income	$	2,122	$	5,693	$	23,900